Betsi Cadwaladr Health Board’s executive says plans for mass vaccinations against Covid-19 are “well advanced” and could start in December.

Dr Chris Stockport, executive director of primary care, told health board members this at their monthly meeting.

News emerged this week of a trial by American pharmaceutical giant Pfizer which claims its vaccine gives 90 per cent protection from Covid.

Detailed information about how long people are protected and what age groups it will be most effective for is yet to be made public.

An Oxford University/AstraZeneca trial of a different vaccine is also said to be close to producing preliminary results.

Dr Stockport said work had been going on to for months on how to distribute the vaccines if and when they get approval in the UK.

He said: “We are formalising those plans now that a date is starting to become a little clearer and a little closer.

“We will be in a position in North Wales to do what we need to do in delivering that vaccination when it becomes available.

“Our distribution will be on a risk-based process as people will have imagined.

“It’s safe to say we are well advanced in working out how that will be delivered and it will require everybody working in a collective way.”

Experts believe it will take around 12 months to vaccinate everyone across the globe who needs the jab.

It is also likely, as happens with flu jabs, people will need periodic boosters as the effects wear off and new strains of the coronavirus are discovered.

It is thought key staff, such as health and social care workers will be first in line to get the new vaccine when it arrives.

The most vulnerable in society are likely to be immunised next, before specific age groups are called in to be protected.